Data Acquisition (DAQ) and Control from Microstar Laboratories

DAP 4400a

Recommended for all new systems: DAP 5380a Data Acquisition Board


The DAP 4400a is now an Obsolete product. For new systems, use the DAP 5380a model.


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Other Compatible Hardware

Other Compatible Software

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Microstar Laboratories, Inc. offers a PCI DAP board optimized for high-speed simultaneous sampling. The DAP 4400a/446 has four onboard A/D converters that each can acquire 800k 14-bit resolution samples per second simultaneously, for an aggregate throughput of 3.2M samples per second. The DAPL 2000 onboard operating system allows real-time work under Windows using LabVIEW, DASYLab, or other software, free from PC-related delays. Real-time functions include software triggering, data reduction, filtering, FFT, and order analysis.

The DAP 4400a:

  • has an onboard Intel i486 processor
  • comes with 16M of DRAM onboard memory
  • is compatible with other a-Series boards
  • works with the 5V PCI bus for PC-based platforms
  • transfers data to PC at high rates -- up to 2.4M samples per second
  • allows fast real-time processing
  • provides 14-bit A/D converter resolution
  • provides input voltage ranges of +/-2.5 volts, +/-5 volts, and +/-10 volts
  • samples analog inputs at up to 800k samples per second per channel
  • 3.2 million samples per second aggregate
  • inherent simultaneous sampling of 4 input pins
  • has expandable analog inputs
  • complies with the EMC Directive 89/336/EEC

There is one DAP 4400a model: the DAP 4400a/446.

The DAP 4400a/446 is optimized for high-speed analog input, and is mainly intended for high-speed simultaneous sampling applications. It can be mixed with any other DAP models in a single synchronized system containing up to 14 DAPs. Each DAP 4400a board can sample inputs simultaneously in four groups of four. So, for example, four groups of 16 simultaneous input channels can be spread across four synchronized DAP 4400a boards with an aggregate throughput of 12.8 million samples per second.

In a transient recorder application, DAPL is programmed to acquire, buffer, and discard data, and to scan the data all the while for a trigger event. Such an event can trigger some action on the channel where the event occurred, or can trigger some action on other channels. The action can include -- but is not limited to -- capturing a block of data acquired before and after the trigger even occurred, and transferring or performing other operations on that block of data.

The DAP 4400a has a PCI host interface, and is capable of high speed data transfers to the host PC. The DAP 4400a requires a 5V 32-bit PCI slot. Using bus mastering DMA transfers, the DAP4400a can transfer data to the host PC at 2.4M samples per second.

DAP 4400a/446 Specifications


Analog Inputs


Expandable to


Voltage Ranges

-2.5 to +2.5 volts, -5 to +5 volts, -10 to +10 volts

Samples (x 1000) per second*


Time increment (nanoseconds)


Minimum time interval (microseconds)*


Maximum Gain


A/D Converters/Resolution (bits)




486 : DX4

Clock Speed(MHz)


Onboard Operating System

DAPL 2000

RAM (Mbytes)


PC Interface Specifications

PC Interface


Samples (x1000) transferred per second**


Samples (x1000) logged/second**


* At 12-bit resolution. To maintain full 14-bit resolution rail-to-rail may require a longer time interval: this gives a lower sampling rate.
** Disk logging and data transfer rates vary with PC platform.

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